Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method for wireless communications, comprising: performing, by a device, a discrete Fourier transform (DFT) on a data stream to generate a first signal in the frequency domain; determining, by the device, a modular permutation index, the modular permutation index being an integer, and the greatest common divisor of the modular permutation index and a number of DFT points used in the DFT equal to one, wherein the modular permutation index is used for performing a modular permutation on the first signal, and the modular permutation index is determined so that the first signal after the modular permutation is performed satisfies a peak to average power ratio (PAPR) criteria, and wherein the modular permutation is a modular arithmetic operation; processing, by the device, the first signal in the frequency domain to generate a second signal in the frequency domain, wherein processing the first signal comprises performing a modular permutation on the first signal in accordance with the modular permutation index, and wherein the modular permutation is performed by rearranging an order of elements in a sequence of the first signal; processing, by the device, the second signal to generate an orthogonal frequency division multiplexing (OFDM) symbol, wherein the OFDM symbol satisfies the PAPR criteria; and transmitting, by the device, the OFDM symbol.
A method for wireless communication reduces signal peaks in OFDM signals. It involves applying a Discrete Fourier Transform (DFT) to a data stream, creating a frequency-domain signal. A "modular permutation index" (a specific integer with mathematical properties related to the DFT size) is chosen to rearrange the frequency components of this signal in a specific order (modular permutation). The goal is to minimize the Peak-to-Average Power Ratio (PAPR). This reordered signal is used to generate an OFDM symbol, which is then transmitted wirelessly. The modular permutation is determined such that the final OFDM signal meets PAPR requirements.
2. The method of claim 1 , wherein the PAPR criteria is satisfied when a PAPR of the OFDM symbol is less than a threshold.
Building upon the wireless communication method that reduces signal peaks using modular permutation, the Peak-to-Average Power Ratio (PAPR) criteria is met when the PAPR of the generated OFDM symbol is below a predefined threshold value. This threshold ensures that the transmitted signal's power fluctuations are within acceptable limits, improving efficiency and reducing distortion.
3. The method of claim 1 , wherein determining the modular permutation index comprises determining the modular permutation index so that a PAPR of the OFDM symbol is less than a threshold.
In the wireless communication method that reduces signal peaks using modular permutation, the determination of the modular permutation index is specifically performed so that the Peak-to-Average Power Ratio (PAPR) of the final Orthogonal Frequency Division Multiplexing (OFDM) symbol remains less than a predetermined threshold value. This direct relationship ensures that the permutation index directly optimizes the signal for lower PAPR.
4. The method of claim 1 , wherein processing the first signal in the frequency domain further comprises performing a cyclic shift in accordance with a cyclic shift parameter on an output signal that results from performing the modular permutation on the first signal, wherein the cyclic shift parameter is an integer that is less than the number of DFT points.
Expanding on the wireless communication method that reduces signal peaks using modular permutation, after applying the modular permutation, a cyclic shift is also applied to the frequency-domain signal. This cyclic shift is determined by a "cyclic shift parameter" (an integer smaller than the number of DFT points). The cyclic shift further modifies the signal before OFDM symbol generation, adding another layer of PAPR reduction.
5. The method of claim 4 , wherein the modular permutation index and the cyclic shift parameter are determined so that a PAPR of the OFDM symbol is less than a threshold.
In the wireless communication method that reduces signal peaks using both modular permutation and cyclic shift, both the modular permutation index and the cyclic shift parameter are jointly chosen so that the resulting Orthogonal Frequency Division Multiplexing (OFDM) symbol has a Peak-to-Average Power Ratio (PAPR) that is less than a predefined threshold. This coordinated approach optimizes both parameters for maximum PAPR reduction.
6. The method of claim 1 , wherein the modular permutation index is signaled in downlink control information.
Continuing the wireless communication method that reduces signal peaks using modular permutation, the specific value of the modular permutation index is signaled to the receiver through downlink control information. This allows the receiver to correctly interpret the transmitted OFDM signal by undoing the permutation performed at the transmitter.
7. The method of claim 1 , further comprising transmitting a pilot reference signal, wherein a modular permutation is performed on the pilot reference signal using the modular permutation index.
Supplementing the wireless communication method that reduces signal peaks using modular permutation, a pilot reference signal is also transmitted. The same modular permutation (using the same modular permutation index) is applied to this pilot signal. This enables the receiver to estimate channel characteristics, even with the applied permutation, and facilitates proper signal demodulation.
8. The method of claim 1 , wherein the modular permutation index is determined for a predetermined number of signals that are processed by performing a modular permutation on the predetermined number of signals in the frequency domain according to the modular permutation index.
Within the wireless communication method that reduces signal peaks using modular permutation, the determined modular permutation index is used consistently for a fixed number of subsequent signals. This means that the same permutation pattern is applied to multiple data streams before generating and transmitting their corresponding Orthogonal Frequency Division Multiplexing (OFDM) symbols, simplifying the implementation and reducing overhead.
9. The method of claim 1 , further comprising determining a range of permutation indexes, wherein the modular permutation index is selected from the range of permutation indexes.
Extending the wireless communication method that reduces signal peaks using modular permutation, a set of possible permutation indexes is pre-defined as a range. The specific modular permutation index used for a given signal is then selected from this pre-defined range, enabling the system to choose the best index based on current channel conditions or other relevant factors.
10. A method for wireless communications, comprising: performing, by a device, a discrete Fourier transform (DFT) on a data stream to generate a first signal in the frequency domain; processing, by the device, the first signal in the frequency domain to generate a second signal in the frequency domain, wherein processing the first signal comprises performing a cyclic shift on the first signal in accordance with a cyclic shift parameter, the cyclic shift parameter being an integer less than a number of DFT points used in performing the DFT; processing, by the device, the second signal to generate an orthogonal frequency division multiplexing (OFDM) symbol, wherein the cyclic shift parameter is determined so that the OFDM symbol satisfies a peak to average power ratio (PAPR) criteria; and transmitting, by the device, the OFDM symbol.
A method for wireless communication reduces signal peaks in OFDM signals by performing a Discrete Fourier Transform (DFT) on a data stream to generate a frequency-domain signal. Then, a cyclic shift is applied to this signal, controlled by a "cyclic shift parameter" (an integer less than the DFT size). The cyclic shift is chosen to minimize the Peak-to-Average Power Ratio (PAPR). The shifted signal is then used to generate an OFDM symbol, which is transmitted wirelessly. The cyclic shift parameter is chosen so the final OFDM signal meets PAPR requirements.
11. The method of claim 10 , wherein the OFDM symbol satisfies the PAPR criteria when a PAPR of the OFDM symbol is less than a threshold.
Refining the wireless communication method that reduces signal peaks using cyclic shift, the Peak-to-Average Power Ratio (PAPR) criteria is met when the PAPR of the generated Orthogonal Frequency Division Multiplexing (OFDM) symbol is less than a specified threshold. This threshold ensures that the transmitted signal maintains a manageable power range.
12. The method of claim 10 , further comprising determining the cyclic shift parameter so that a PAPR of the OFDM symbol is less than a threshold.
In the wireless communication method that reduces signal peaks using cyclic shift, the cyclic shift parameter is selected so that the Peak-to-Average Power Ratio (PAPR) of the final Orthogonal Frequency Division Multiplexing (OFDM) symbol falls below a predetermined threshold. This ensures the cyclic shift directly contributes to reducing the PAPR of the transmitted signal.
13. The method of claim 10 , wherein processing the first signal in the frequency domain further comprises performing a modular permutation on the first signal in accordance with a modular permutation index prior to performing the cyclic shift on the first signal, wherein the modular permutation index is an integer, and the greatest common divisor of the modular permutation index and the number of DFT points is equal to one, and wherein the modular permutation is a modular arithmetic operation that rearranges an order of elements in a sequence of the first signal.
Expanding the wireless communication method that reduces signal peaks using cyclic shift, *before* the cyclic shift is applied, a modular permutation is performed on the frequency-domain signal. This permutation uses a "modular permutation index" (a specific integer related to the DFT size, used in modular arithmetic). The permutation rearranges the order of elements in the frequency-domain signal, and then the cyclic shift is applied to the *permuted* signal, adding another level of PAPR reduction.
14. The method of claim 13 , further comprising determining the modular permutation index and the cyclic shift parameter so that a PAPR of the OFDM symbol is less than a threshold.
In the wireless communication method that reduces signal peaks using both modular permutation and cyclic shift, the modular permutation index and the cyclic shift parameter are jointly determined to ensure that the Peak-to-Average Power Ratio (PAPR) of the resulting Orthogonal Frequency Division Multiplexing (OFDM) symbol remains below a predefined threshold, optimizing both parameters for PAPR minimization.
15. The method of claim 10 , wherein the cyclic shift parameter is signaled in downlink control information.
Expanding on the wireless communication method that reduces signal peaks using cyclic shift, the cyclic shift parameter is communicated to the receiver through downlink control information, enabling the receiver to correctly decode the transmitted signal by reversing the cyclic shift applied at the transmitter.
16. The method of claim 10 , further comprising transmitting a pilot reference signal, wherein a cyclic shift is performed on the pilot reference signal using the cyclic shift parameter.
Supplementing the wireless communication method that reduces signal peaks using cyclic shift, a pilot reference signal is also transmitted. The same cyclic shift (using the same cyclic shift parameter) is applied to this pilot signal, allowing the receiver to estimate channel characteristics even with the applied shift.
17. The method of claim 10 , wherein the cyclic shift parameter is determined for a predetermined number of signals that are processed by performing a cyclic shift on the predetermined number of signals in the frequency domain according to the cyclic shift.
Within the wireless communication method that reduces signal peaks using cyclic shift, the chosen cyclic shift parameter is applied consistently to a predetermined number of subsequent signals. This ensures that the same shift is used for multiple data streams before generating and transmitting their corresponding Orthogonal Frequency Division Multiplexing (OFDM) symbols.
18. The method of claim 10 , further comprising determining a range of cyclic shift parameters, wherein the cyclic shift parameter is selected from the range of cyclic shift parameters.
Expanding on the wireless communication method that reduces signal peaks using cyclic shift, a range of potential cyclic shift parameters is defined. The specific cyclic shift parameter used for a given signal is then selected from within this range, enabling the system to adapt the shift based on channel conditions or other factors.
19. A device, comprising: a memory storage comprising instructions; and one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to: perform a discrete Fourier transform (DFT) on a data stream to generate a first signal in the frequency domain; determine a modular permutation index, the modular permutation index being an integer, and the greatest common divisor of the modular permutation index and a number of DFT points used in performing the DFT equal to one, wherein the modular permutation index is used for performing a modular permutation on the first signal, and the modular permutation index is determined so that the first signal after the modular permutation is performed is transmitted with a peak to average power ratio (PAPR) that satisfies a PAPR criteria, and wherein the modular permutation is a modular arithmetic operation; perform a modular permutation on the first signal in accordance with the modular permutation index to generate a second signal, the modular permutation performed on the first signal rearranges an order of elements in a sequence of the first signal; process the second signal to generate an orthogonal frequency division multiplexing (OFDM) symbol; and transmit the OFDM symbol, wherein the OFDM symbol is transmitted with a PAPR satisfying the PAPR criteria.
A device performs wireless communication with reduced signal peaks. It includes a processor and memory storing instructions. The instructions cause the device to: perform a DFT on a data stream; determine a modular permutation index (an integer with specific mathematical properties); rearrange the frequency components using this index (modular permutation) to minimize Peak-to-Average Power Ratio (PAPR); generate an OFDM symbol from the rearranged signal; and transmit the OFDM symbol. The permutation index is selected so the transmitted OFDM signal has a PAPR meeting predefined criteria.
20. A device, comprising: a memory storage comprising instructions; and one or more processors in communication with the memory storage, wherein the one or more processors execute the instructions to: perform a discrete Fourier transform (DFT) on a data stream to generate a first signal in the frequency domain; perform a cyclic shift on the first signal in accordance with a cyclic shift parameter to generate a second signal, the cyclic shift parameter being an integer that is less than a number of DFT points used in performing the DFT; process the second signal to generate an orthogonal frequency division multiplexing (OFDM) symbol, wherein the cyclic shift parameter is determined so that the OFDM symbol satisfies a peak to average power ratio (PAPR) criteria; and transmit the OFDM symbol.
A device performs wireless communication with reduced signal peaks. It includes a processor and memory storing instructions. The instructions cause the device to: perform a DFT on a data stream; apply a cyclic shift to the frequency-domain signal using a cyclic shift parameter; generate an OFDM symbol from the shifted signal; and transmit the OFDM symbol. The cyclic shift parameter is chosen specifically so that the final transmitted OFDM symbol meets a predetermined Peak-to-Average Power Ratio (PAPR) criteria, ensuring efficient signal transmission.
Unknown
December 19, 2017
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.